view tests/test-merge-force.t @ 30435:b86a448a2965

zstd: vendor python-zstandard 0.5.0

As the commit message for the previous changeset says, we wish
for zstd to be a 1st class citizen in Mercurial. To make that
happen, we need to enable Python to talk to the zstd C API. And
that requires bindings.

This commit vendors a copy of existing Python bindings. Why do we
need to vendor? As the commit message of the previous commit says,
relying on systems in the wild to have the bindings or zstd present
is a losing proposition. By distributing the zstd and bindings with
Mercurial, we significantly increase our chances that zstd will
work. Since zstd will deliver a better end-user experience by
achieving better performance, this benefits our users. Another
reason is that the Python bindings still aren't stable and the
API is somewhat fluid. While Mercurial could be coded to target
multiple versions of the Python bindings, it is safer to bundle
an explicit, known working version.

The added Python bindings are mostly a fully-featured interface
to the zstd C API. They allow one-shot operations, streaming,
reading and writing from objects implements the file object
protocol, dictionary compression, control over low-level compression
parameters, and more. The Python bindings work on Python 2.6,
2.7, and 3.3+ and have been tested on Linux and Windows. There are
CFFI bindings, but they are lacking compared to the C extension.
Upstream work will be needed before we can support zstd with PyPy.
But it will be possible.

The files added in this commit come from Git commit
e637c1b214d5f869cf8116c550dcae23ec13b677 from
https://github.com/indygreg/python-zstandard and are added without
modifications. Some files from the upstream repository have been
omitted, namely files related to continuous integration.

In the spirit of full disclosure, I'm the maintainer of the
"python-zstandard" project and have authored 100% of the code
added in this commit. Unfortunately, the Python bindings have
not been formally code reviewed by anyone. While I've tested
much of the code thoroughly (I even have tests that fuzz APIs),
there's a good chance there are bugs, memory leaks, not well
thought out APIs, etc. If someone wants to review the code and
send feedback to the GitHub project, it would be greatly
appreciated.

Despite my involvement with both projects, my opinions of code
style differ from Mercurial's. The code in this commit introduces
numerous code style violations in Mercurial's linters. So, the code
is excluded from most lints. However, some violations I agree with.
These have been added to the known violations ignore list for now.

Set up a base, local, and remote changeset, as well as the working copy state.
Files names are of the form base_remote_local_working-copy. For example,
content1_content2_content1_content2-untracked represents a
file that was modified in the remote changeset, left untouched in the
local changeset, and then modified in the working copy to match the
remote content, then finally forgotten.

  $ hg init repo
  $ cd repo

Create base changeset

  $ python $TESTDIR/generate-working-copy-states.py state 3 1
  $ hg addremove -q --similarity 0
  $ hg commit -qm 'base'

Create remote changeset

  $ python $TESTDIR/generate-working-copy-states.py state 3 2
  $ hg addremove -q --similarity 0
  $ hg commit -qm 'remote'

Create local changeset

  $ hg update -q 0
  $ python $TESTDIR/generate-working-copy-states.py state 3 3
  $ hg addremove -q --similarity 0
  $ hg commit -qm 'local'

Set up working directory

  $ python $TESTDIR/generate-working-copy-states.py state 3 wc
  $ hg addremove -q --similarity 0
  $ hg forget *_*_*_*-untracked
  $ rm *_*_*_missing-*

  $ hg status -A
  M content1_content1_content1_content4-tracked
  M content1_content1_content3_content1-tracked
  M content1_content1_content3_content4-tracked
  M content1_content2_content1_content2-tracked
  M content1_content2_content1_content4-tracked
  M content1_content2_content2_content1-tracked
  M content1_content2_content2_content4-tracked
  M content1_content2_content3_content1-tracked
  M content1_content2_content3_content2-tracked
  M content1_content2_content3_content4-tracked
  M content1_missing_content1_content4-tracked
  M content1_missing_content3_content1-tracked
  M content1_missing_content3_content4-tracked
  M missing_content2_content2_content4-tracked
  M missing_content2_content3_content2-tracked
  M missing_content2_content3_content4-tracked
  M missing_missing_content3_content4-tracked
  A content1_content1_missing_content1-tracked
  A content1_content1_missing_content4-tracked
  A content1_content2_missing_content1-tracked
  A content1_content2_missing_content2-tracked
  A content1_content2_missing_content4-tracked
  A content1_missing_missing_content1-tracked
  A content1_missing_missing_content4-tracked
  A missing_content2_missing_content2-tracked
  A missing_content2_missing_content4-tracked
  A missing_missing_missing_content4-tracked
  R content1_content1_content1_content1-untracked
  R content1_content1_content1_content4-untracked
  R content1_content1_content1_missing-untracked
  R content1_content1_content3_content1-untracked
  R content1_content1_content3_content3-untracked
  R content1_content1_content3_content4-untracked
  R content1_content1_content3_missing-untracked
  R content1_content2_content1_content1-untracked
  R content1_content2_content1_content2-untracked
  R content1_content2_content1_content4-untracked
  R content1_content2_content1_missing-untracked
  R content1_content2_content2_content1-untracked
  R content1_content2_content2_content2-untracked
  R content1_content2_content2_content4-untracked
  R content1_content2_content2_missing-untracked
  R content1_content2_content3_content1-untracked
  R content1_content2_content3_content2-untracked
  R content1_content2_content3_content3-untracked
  R content1_content2_content3_content4-untracked
  R content1_content2_content3_missing-untracked
  R content1_missing_content1_content1-untracked
  R content1_missing_content1_content4-untracked
  R content1_missing_content1_missing-untracked
  R content1_missing_content3_content1-untracked
  R content1_missing_content3_content3-untracked
  R content1_missing_content3_content4-untracked
  R content1_missing_content3_missing-untracked
  R missing_content2_content2_content2-untracked
  R missing_content2_content2_content4-untracked
  R missing_content2_content2_missing-untracked
  R missing_content2_content3_content2-untracked
  R missing_content2_content3_content3-untracked
  R missing_content2_content3_content4-untracked
  R missing_content2_content3_missing-untracked
  R missing_missing_content3_content3-untracked
  R missing_missing_content3_content4-untracked
  R missing_missing_content3_missing-untracked
  ! content1_content1_content1_missing-tracked
  ! content1_content1_content3_missing-tracked
  ! content1_content1_missing_missing-tracked
  ! content1_content2_content1_missing-tracked
  ! content1_content2_content2_missing-tracked
  ! content1_content2_content3_missing-tracked
  ! content1_content2_missing_missing-tracked
  ! content1_missing_content1_missing-tracked
  ! content1_missing_content3_missing-tracked
  ! content1_missing_missing_missing-tracked
  ! missing_content2_content2_missing-tracked
  ! missing_content2_content3_missing-tracked
  ! missing_content2_missing_missing-tracked
  ! missing_missing_content3_missing-tracked
  ! missing_missing_missing_missing-tracked
  ? content1_content1_missing_content1-untracked
  ? content1_content1_missing_content4-untracked
  ? content1_content2_missing_content1-untracked
  ? content1_content2_missing_content2-untracked
  ? content1_content2_missing_content4-untracked
  ? content1_missing_missing_content1-untracked
  ? content1_missing_missing_content4-untracked
  ? missing_content2_missing_content2-untracked
  ? missing_content2_missing_content4-untracked
  ? missing_missing_missing_content4-untracked
  C content1_content1_content1_content1-tracked
  C content1_content1_content3_content3-tracked
  C content1_content2_content1_content1-tracked
  C content1_content2_content2_content2-tracked
  C content1_content2_content3_content3-tracked
  C content1_missing_content1_content1-tracked
  C content1_missing_content3_content3-tracked
  C missing_content2_content2_content2-tracked
  C missing_content2_content3_content3-tracked
  C missing_missing_content3_content3-tracked

Merge with remote

# Notes:
# - local and remote changed content1_content2_*_content2-untracked
#   in the same way, so it could potentially be left alone

  $ hg merge -f --tool internal:merge3 'desc("remote")' 2>&1 | tee $TESTTMP/merge-output-1
  local [working copy] changed content1_missing_content1_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_content3_content3-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_content3_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_missing_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_content3-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content1_content4-tracked
  merging content1_content2_content2_content1-tracked
  merging content1_content2_content2_content4-tracked
  merging content1_content2_content3_content1-tracked
  merging content1_content2_content3_content3-tracked
  merging content1_content2_content3_content4-tracked
  merging content1_content2_missing_content1-tracked
  merging content1_content2_missing_content4-tracked
  merging missing_content2_content2_content4-tracked
  merging missing_content2_content3_content3-tracked
  merging missing_content2_content3_content4-tracked
  merging missing_content2_missing_content4-tracked
  merging missing_content2_missing_content4-untracked
  warning: conflicts while merging content1_content2_content1_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content2_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content3_content3-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content3_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_missing_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content2_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content3_content3-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content3_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_missing_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_missing_content4-untracked! (edit, then use 'hg resolve --mark')
  18 files updated, 3 files merged, 8 files removed, 35 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

Check which files need to be resolved (should correspond to the output above).
This should be the files for which the base (1st filename segment), the remote
(2nd segment) and the working copy (4th segment) are all different.

Interestingly, one untracked file got merged and added, which corresponds to the
odd 'if force and branchmerge and different' case in manifestmerge().

  $ hg resolve -l
  U content1_content2_content1_content1-untracked
  U content1_content2_content1_content2-untracked
  U content1_content2_content1_content4-tracked
  U content1_content2_content1_content4-untracked
  U content1_content2_content1_missing-tracked
  U content1_content2_content1_missing-untracked
  R content1_content2_content2_content1-tracked
  U content1_content2_content2_content1-untracked
  U content1_content2_content2_content2-untracked
  U content1_content2_content2_content4-tracked
  U content1_content2_content2_content4-untracked
  U content1_content2_content2_missing-tracked
  U content1_content2_content2_missing-untracked
  R content1_content2_content3_content1-tracked
  U content1_content2_content3_content1-untracked
  U content1_content2_content3_content2-untracked
  U content1_content2_content3_content3-tracked
  U content1_content2_content3_content3-untracked
  U content1_content2_content3_content4-tracked
  U content1_content2_content3_content4-untracked
  U content1_content2_content3_missing-tracked
  U content1_content2_content3_missing-untracked
  R content1_content2_missing_content1-tracked
  U content1_content2_missing_content1-untracked
  U content1_content2_missing_content2-untracked
  U content1_content2_missing_content4-tracked
  U content1_content2_missing_content4-untracked
  U content1_content2_missing_missing-tracked
  U content1_content2_missing_missing-untracked
  U content1_missing_content1_content4-tracked
  U content1_missing_content3_content3-tracked
  U content1_missing_content3_content4-tracked
  U content1_missing_missing_content4-tracked
  U missing_content2_content2_content4-tracked
  U missing_content2_content3_content3-tracked
  U missing_content2_content3_content4-tracked
  U missing_content2_missing_content4-tracked
  U missing_content2_missing_content4-untracked

Check status and file content

Some files get added (e.g. content1_content2_content1_content1-untracked)

It is not intuitive that content1_content2_content1_content4-tracked gets
merged while content1_content2_content1_content4-untracked gets overwritten.
Any *_content2_*-untracked triggers the modified/deleted prompt and then gets
overwritten.

A lot of untracked files become tracked, for example
content1_content2_content2_content2-untracked.

*_missing_missing_missing-tracked is reported as removed ('R'), which
doesn't make sense since the file did not exist in the parent, but on the
other hand, merged-in additions are reported as modifications, which is
almost as strange.

missing_missing_content3_missing-tracked becomes removed ('R'), even though
the remote side did not touch the file

  $ checkstatus() {
  >   for f in `python $TESTDIR/generate-working-copy-states.py filelist 3`
  >   do
  >     echo
  >     hg status -A $f
  >     if test -f $f
  >     then
  >       cat $f
  >     else
  >       echo '<missing>'
  >     fi
  >   done
  > }
  $ checkstatus 2>&1 | tee $TESTTMP/status1
  
  C content1_content1_content1_content1-tracked
  content1
  
  R content1_content1_content1_content1-untracked
  content1
  
  M content1_content1_content1_content4-tracked
  content4
  
  R content1_content1_content1_content4-untracked
  content4
  
  ! content1_content1_content1_missing-tracked
  <missing>
  
  R content1_content1_content1_missing-untracked
  <missing>
  
  M content1_content1_content3_content1-tracked
  content1
  
  R content1_content1_content3_content1-untracked
  content1
  
  C content1_content1_content3_content3-tracked
  content3
  
  R content1_content1_content3_content3-untracked
  content3
  
  M content1_content1_content3_content4-tracked
  content4
  
  R content1_content1_content3_content4-untracked
  content4
  
  ! content1_content1_content3_missing-tracked
  <missing>
  
  R content1_content1_content3_missing-untracked
  <missing>
  
  A content1_content1_missing_content1-tracked
  content1
  
  ? content1_content1_missing_content1-untracked
  content1
  
  A content1_content1_missing_content4-tracked
  content4
  
  ? content1_content1_missing_content4-untracked
  content4
  
  ! content1_content1_missing_missing-tracked
  <missing>
  
  content1_content1_missing_missing-untracked: * (glob)
  <missing>
  
  M content1_content2_content1_content1-tracked
  content2
  
  M content1_content2_content1_content1-untracked
  content2
  
  M content1_content2_content1_content2-tracked
  content2
  
  M content1_content2_content1_content2-untracked
  content2
  
  M content1_content2_content1_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  content1
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M content1_content2_content1_content4-untracked
  content2
  
  M content1_content2_content1_missing-tracked
  content2
  
  M content1_content2_content1_missing-untracked
  content2
  
  M content1_content2_content2_content1-tracked
  content2
  
  M content1_content2_content2_content1-untracked
  content2
  
  C content1_content2_content2_content2-tracked
  content2
  
  M content1_content2_content2_content2-untracked
  content2
  
  M content1_content2_content2_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  content1
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M content1_content2_content2_content4-untracked
  content2
  
  M content1_content2_content2_missing-tracked
  content2
  
  M content1_content2_content2_missing-untracked
  content2
  
  M content1_content2_content3_content1-tracked
  content2
  
  M content1_content2_content3_content1-untracked
  content2
  
  M content1_content2_content3_content2-tracked
  content2
  
  M content1_content2_content3_content2-untracked
  content2
  
  M content1_content2_content3_content3-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content3
  ||||||| base
  content1
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M content1_content2_content3_content3-untracked
  content2
  
  M content1_content2_content3_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  content1
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M content1_content2_content3_content4-untracked
  content2
  
  M content1_content2_content3_missing-tracked
  content2
  
  M content1_content2_content3_missing-untracked
  content2
  
  M content1_content2_missing_content1-tracked
  content2
  
  M content1_content2_missing_content1-untracked
  content2
  
  M content1_content2_missing_content2-tracked
  content2
  
  M content1_content2_missing_content2-untracked
  content2
  
  M content1_content2_missing_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  content1
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M content1_content2_missing_content4-untracked
  content2
  
  M content1_content2_missing_missing-tracked
  content2
  
  M content1_content2_missing_missing-untracked
  content2
  
  R content1_missing_content1_content1-tracked
  <missing>
  
  R content1_missing_content1_content1-untracked
  content1
  
  M content1_missing_content1_content4-tracked
  content4
  
  R content1_missing_content1_content4-untracked
  content4
  
  R content1_missing_content1_missing-tracked
  <missing>
  
  R content1_missing_content1_missing-untracked
  <missing>
  
  R content1_missing_content3_content1-tracked
  <missing>
  
  R content1_missing_content3_content1-untracked
  content1
  
  C content1_missing_content3_content3-tracked
  content3
  
  R content1_missing_content3_content3-untracked
  content3
  
  M content1_missing_content3_content4-tracked
  content4
  
  R content1_missing_content3_content4-untracked
  content4
  
  R content1_missing_content3_missing-tracked
  <missing>
  
  R content1_missing_content3_missing-untracked
  <missing>
  
  R content1_missing_missing_content1-tracked
  <missing>
  
  ? content1_missing_missing_content1-untracked
  content1
  
  A content1_missing_missing_content4-tracked
  content4
  
  ? content1_missing_missing_content4-untracked
  content4
  
  R content1_missing_missing_missing-tracked
  <missing>
  
  content1_missing_missing_missing-untracked: * (glob)
  <missing>
  
  C missing_content2_content2_content2-tracked
  content2
  
  M missing_content2_content2_content2-untracked
  content2
  
  M missing_content2_content2_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M missing_content2_content2_content4-untracked
  content2
  
  M missing_content2_content2_missing-tracked
  content2
  
  M missing_content2_content2_missing-untracked
  content2
  
  M missing_content2_content3_content2-tracked
  content2
  
  M missing_content2_content3_content2-untracked
  content2
  
  M missing_content2_content3_content3-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content3
  ||||||| base
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M missing_content2_content3_content3-untracked
  content2
  
  M missing_content2_content3_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M missing_content2_content3_content4-untracked
  content2
  
  M missing_content2_content3_missing-tracked
  content2
  
  M missing_content2_content3_missing-untracked
  content2
  
  M missing_content2_missing_content2-tracked
  content2
  
  M missing_content2_missing_content2-untracked
  content2
  
  M missing_content2_missing_content4-tracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M missing_content2_missing_content4-untracked
  <<<<<<< working copy: 0447570f1af6 - test: local
  content4
  ||||||| base
  =======
  content2
  >>>>>>> merge rev:    85100b8c675b  - test: remote
  
  M missing_content2_missing_missing-tracked
  content2
  
  M missing_content2_missing_missing-untracked
  content2
  
  C missing_missing_content3_content3-tracked
  content3
  
  R missing_missing_content3_content3-untracked
  content3
  
  M missing_missing_content3_content4-tracked
  content4
  
  R missing_missing_content3_content4-untracked
  content4
  
  R missing_missing_content3_missing-tracked
  <missing>
  
  R missing_missing_content3_missing-untracked
  <missing>
  
  A missing_missing_missing_content4-tracked
  content4
  
  ? missing_missing_missing_content4-untracked
  content4
  
  R missing_missing_missing_missing-tracked
  <missing>
  
  missing_missing_missing_missing-untracked: * (glob)
  <missing>

  $ for f in `python $TESTDIR/generate-working-copy-states.py filelist 3`
  > do
  >   if test -f ${f}.orig
  >   then
  >     echo ${f}.orig:
  >     cat ${f}.orig
  >   fi
  > done
  content1_content2_content1_content4-tracked.orig:
  content4
  content1_content2_content2_content4-tracked.orig:
  content4
  content1_content2_content3_content3-tracked.orig:
  content3
  content1_content2_content3_content4-tracked.orig:
  content4
  content1_content2_missing_content4-tracked.orig:
  content4
  missing_content2_content2_content4-tracked.orig:
  content4
  missing_content2_content3_content3-tracked.orig:
  content3
  missing_content2_content3_content4-tracked.orig:
  content4
  missing_content2_missing_content4-tracked.orig:
  content4
  missing_content2_missing_content4-untracked.orig:
  content4

Re-resolve and check status

  $ hg resolve --unmark --all
  $ hg resolve --all --tool :local
  (no more unresolved files)
  $ hg resolve --unmark --all
  $ hg resolve --all --tool internal:merge3
  other [merge rev] changed content1_content2_content1_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content1_content4-tracked
  other [merge rev] changed content1_content2_content1_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content1_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content2_content1-tracked
  other [merge rev] changed content1_content2_content2_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content2_content4-tracked
  other [merge rev] changed content1_content2_content2_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content2_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content3_content1-tracked
  other [merge rev] changed content1_content2_content3_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content3_content3-tracked
  other [merge rev] changed content1_content2_content3_content3-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_content3_content4-tracked
  other [merge rev] changed content1_content2_content3_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_content3_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_missing_content1-tracked
  other [merge rev] changed content1_content2_missing_content1-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_content2-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  merging content1_content2_missing_content4-tracked
  other [merge rev] changed content1_content2_missing_content4-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_missing-tracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  other [merge rev] changed content1_content2_missing_missing-untracked which local [working copy] deleted
  use (c)hanged version, leave (d)eleted, or leave (u)nresolved? u
  local [working copy] changed content1_missing_content1_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_content3_content3-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_content3_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  local [working copy] changed content1_missing_missing_content4-tracked which other [merge rev] deleted
  use (c)hanged version, (d)elete, or leave (u)nresolved? u
  merging missing_content2_content2_content4-tracked
  merging missing_content2_content3_content3-tracked
  merging missing_content2_content3_content4-tracked
  merging missing_content2_missing_content4-tracked
  merging missing_content2_missing_content4-untracked
  warning: conflicts while merging content1_content2_content1_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content2_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content3_content3-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_content3_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging content1_content2_missing_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content2_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content3_content3-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_content3_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_missing_content4-tracked! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging missing_content2_missing_content4-untracked! (edit, then use 'hg resolve --mark')
  [1]
  $ checkstatus > $TESTTMP/status2 2>&1
  $ cmp $TESTTMP/status1 $TESTTMP/status2 || diff -U8 $TESTTMP/status1 $TESTTMP/status2

Set up working directory again

  $ hg -q update --clean 2
  $ hg --config extensions.purge= purge
  $ python $TESTDIR/generate-working-copy-states.py state 3 wc
  $ hg addremove -q --similarity 0
  $ hg forget *_*_*_*-untracked
  $ rm *_*_*_missing-*

Merge with checkunknown = warn, see that behavior is the same as before
  $ hg merge -f --tool internal:merge3 'desc("remote")' --config merge.checkunknown=warn > $TESTTMP/merge-output-2 2>&1
  [1]
  $ cmp $TESTTMP/merge-output-1 $TESTTMP/merge-output-2 || diff -U8 $TESTTMP/merge-output-1 $TESTTMP/merge-output-2